There are no guarantees in life that we'll always get everything we want. Just the opposite in fact. Most of the time we dont get everything we want and certainly not if we dont put effort into getting it. You want something badly enough you gotta make it happen, not sit around waiting for it to just happen or for someone else to give it to you.
Well first, you may not know the right people. Second, you may not have the skills or mindset necessary to achieve what you want. Third, you may not be ready for what you think you want. And lastly, you would be a spoiled brat if you had everything you wanted.